未格式化的二进制文件输入 [英] Unformatted binary file input

问题描述

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
	ofstream out("f.bin");
	char c = 0x61;
	out.write(&c, sizeof(char));

	ifstream in("f.bin");
	char d;
	in.read(&d, sizeof(char));
	if (d != 0x61) cerr << "Extraction failed!" << endl; //this always appears

	return 0;
}

这是我尝试处理二进制文件i / o的简化片段。十六进制编辑器显示写入成功（f.bin中的'a''），但我不知道为什么我无法从文件（）中提取char。我在这里错过了什么？

This is a simplified snippet of my attempt in a practice of dealing with binary file i/o. The hex editor shows that writing is successful (''a'' in f.bin), but I have no idea why I cannot extract the char from the file (). What did I miss here?

推荐答案

试试：

Try:

int main()
{
	ofstream out("test.bin", ofstream::out);

	char c = 0x61;
	out.write(&c, sizeof(char));

	out.close();
 
	ifstream in("test.bin", ofstream::in);
	char d;
	in.read(&d, sizeof(char));
	if (d != 0x61) cerr << "Extraction failed!" << endl; //this always appears
	in.close();

	return 0;
}

http://www.cplusplus.com/doc/tutorial/files/ [ ^ ]

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